| Lines 160-166
          
      
      
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          | 160 |  | 160 |  | 
        
          | 161 | 	def attribute(self, token, base): | 161 | 	def attribute(self, token, base): | 
        
          | 162 | 		if 'name' in token.attrs: | 162 | 		if 'name' in token.attrs: | 
          
            
              | 163 | 			if token.attrs['name'] in base.info: | 163 | 			if base and hasattr(base, 'info') and token.attrs['name'] in base.info: | 
        
          | 164 | 				value = base.info[token.attrs['name']] | 164 | 				value = base.info[token.attrs['name']] | 
        
          | 165 | 				if isinstance(value, (list, tuple)): | 165 | 				if isinstance(value, (list, tuple)): | 
        
          | 166 | 					if not value or (isinstance(value, str) and value.lower() == 'none'): | 166 | 					if not value or (isinstance(value, str) and value.lower() == 'none'): |